It is expected that noise levels will be kept to a minimum outside of these times. Monday to Friday: before 7 am and after 8 pm. Weekends and public holidays: before 9 am and after 8 pm. Note: The prohibited times apply when the noise can be heard from inside a habitable room of another residential premises. Any residential noise can still be considered unreasonable outside the prohibited times: some industries are are not covered under these regulations.

The above was taken from our local council site. I researched it a while ago when a neighbour complained a delivery lorry at 7:30 made a noise when it reversed for all of 15 seconds!!!

All timings are recommended not statutory UK law, having said that I think before 7.00 is a no no, 7.00 is ok, 7.30 is better, 8.00 don't care what the neighbours think and most of us finish by 18.30. As most CT's/SM's hours are early morning and late afternoon we have to fit our jobs in when we can.

I don't think you stand outside the neighbours house for hours on end but move around your site and unless you have a very old petrol leaf blower then the average blower is 64 - 75 decibels @ 50 feet, speech is 65 decibels so unless you have a very small site surrounded by houses up to your fence then I can't see to much of a problem, especially if it only one neighbour.

"All warfare is based on deception. Thus, when able to attack, we must seem unable. Hold out bait to entice the enemy. Feign disorder, and crush him. If he is in superior strength, evade him. If your opponent is quick to anger, seek to irritate him. Pretend to be weak, that he may grow arrogant." Sun Tzu (Art of War)